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(No Model) E. J. MOORE;

SEGTIONAL SAFETY BOILER.

' Patented "Sept, 4. 1883.

- F'IE. I

- IIIE UN TED ST TES PATENT OFFICE.

EDWARD J. MOORE, OF BALTIMORE, MARYLAND.

SECTIQNAL SAFETY-BOILER."

SPECIFICATION forming part of Letters Patent No. 284,468, datedSeptember I, 1883.

In the boiler embodying my improvements the ends of the tubes whichconstitute the main portion of the boiler proper are secured withinsuitable water-legs by expansion-that is to say, each tube passesentirely through the said leg and is expanded within the two platesforming the walls thereof to effect tight joints. The outer end of thetube is stopped or closed by means of a cap. the boiler which isgenerally termed the steamdrum, but which also contains water, isconstructed of a series of tubes similar to 'those above alluded to, andthey are united in groups of three by boxes of such shape as will allowof their being interlocked to form an imperforate wall. These boxes areunited by means of tubes and the whole connected to the upper end of thewater-legs before described. The lower or main tubes have partitionplates, which, together with the walls, effect a serpentine movement ofthe proparts in all the views.

ducts of combustion in their passage from the furnace to the backconnection. The rear water-leg terminates at its lower end in a muddrum,from which all sediment may be blown.

In the further description of my said invention which follows referenceis made to the accompanying drawings, forming a part hereof, and inwhich Figure I is a longitudinal section of the improved boiler. Fig. IIis a partly-sectional front View of the same. Figs. III and IV aredetails of the invention on an enlarged scale. Similar letters ofreference indicate similar .A A are the inain tubes, and B B thewater-legs, to which the said tubes are secured.

The tubes A are expanded in the plates a, which form the water-legs, andthe said plates, if of wrought-iron, are connected at the sides and atthe bottom bymeans of rivets. The upperends of the water-legs Bareconnected The portion of Application filed January 15, 1883. (N0 model.)

to a series of boxes, 0, to which the upper tubes are fastened.

By referring specially to Figs. II and IV it will be seen that all theboxes 0 receive the ends of three tubes, which are placed in the form ofan equilateral triangle, and the outline of the box is somewhat of thatshape, it having a wide and a narrow end. By this means the boxes, whenplaced .as shown in Fig. II, form a continuous wall, and all the tubeshave the same relative positionthat is to say, the tubes are equidistantwithout being in vertical rows. Each of the boxes 0 is connected tothose immediately above and below itv by means of tubes b, expanded insuitable openings and made water-tight. The boxes Ohave removable plateswhich cover the three tubes,

and are held in place through the medium of ward end of the tubes A. yThe back leg has before alluded to, and de also an opening, K, which isat all times open,

and a series of smaller openings, which together give the proper area ofcalorimeter and admit the products of combustion to the back connection,L. The course of the products of combustion is indicated by dottedarrows.

The upper boxes, C, are provided with nozzles M, to which the steam-pipeleading to the engine is attached. I

The construction and arrangement of the boxes 0 admit of an increase ofsteam room or space above the water-line, which is indicated by thedotted lines z z, by merely increasing the number of sections.

The boiler, constructed as described, has.

great inherent strength, and the joints are such that expansion andcontraction of the various parts will not cause leakage, for thereasonthat inside wall of which boxes three tubes are inexpanded tubes have atendency to expand serted and fastened, and the said boxes closed 10slightly if released from the apertures in which in front by means ofremovable plates, subthey are confined, stantially as and for thepurpose specified.

' 5 I claim as my invention EDWARD J. MOORE.

In a sectional boiler, a portion of the legs Witnesses: thereof formedof a series of practically trian- 1 ED. J. DIGGS, gular boxes united bypipes, into the back or WM. S. HOWARD.

